DarkSUSY. Joakim Edsjö With Torsten Bringmann, Paolo Gondolo, Lars Bergström, Piero Ullio and Gintaras Duda. APS Meeting
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1 DarkSUSY Joakim Edsjö With Torsten Bringmann, Paolo Gondolo, Lars Bergström, Piero Ullio and Gintaras Duda APS Meeting
2 Ways to search for dark matter Accelerator searches LHC Rare decays... Direct searches Spin-independent scattering Spin-dependent scattering Gamma rays from the galaxy Neutrinos from the Earth/Sun Antiprotons from the galactic halo Antideuterons from the galactic halo Indirect searches Positrons from the galactic halo Dark Stars... Current version: darksusy.org Will not cover all of these... Need to treat all of these in a consistent manner, both regarding particle physics and astrophysics
3 Calculation flowchart DarkSUSY can do all of these steps, or other codes can be used for some steps if one so wishes Particle physics model parameters Masses, couplings Accelerator and other lab constraints Relic density calculation Direct and indirect rates Compare with data! Parameters within a model, e.g. pmssm, CMSSM, KK, scalar singlet, generic Wimp etc Spectrum calculator (e.g. RGE solver) Direct searches, rare decays, precision measurements Annihilation cross section calculator and Boltzmann equation solver Rate calculator Compare individual rates or perform global fits
4 Outline Introduction to and layout of DarkSUSY Relic density Direct detection Indirect detection: - gamma rays - charged cosmic rays - neutrinos (from the Sun/Earth) DarkSUSY 6 coming soon
5 DarkSUSY can calculate Weff for SUSY or you can supply your own and use DarkSUSY as a Boltzmann equation solver. Interface to DM@NLO for SUSY coming. Relic density DarkSUSY implementation We solve the Boltzmann equation, dn dt = 3Hn h e vi n 2 n 2 eq numerically, calculating the thermally averaged annihilation R ps cross section, 1 dp 0 e p 2 e W e K 1 h e vi = m 4 1 T h P i g i g 1 m 2 i m 2 1 K 2 X p ij g i g j W e = p ij 11 g 2 W ij ; W ij =4E 1 E 2 ij v ij 1 in every step using tabulated Weff(p). m i T T i 2
6 Example, generic WIMP ( v)[10 26 cm 3 s 1 ] h 2 = WIMP mass [GeV] cf. Steigman, 2012
7 Direct detection Routines to calculate the spin-independent and spindependent scattering cross sections on protons and neutrons. These are most easily used to compare with experimental results. Also routines to calculate the differential rates on various targets including both spin-independent and spindependent form factors. Halo model and velocity distribution can be chosen arbitrarily Annual modulation signal can be calculated Different sets of form factors available
8 Indirect rates Annihilation channels As we are very interested in trying to observe the annihilation products from dark matter annihilation, we need to investigate what they are. Some of the relevant are:! 8 >< >: b b t t + W W + Z 0 Z 0 H ± W ± H 0 i Z0 Note: ν final states are absent for neutralinos These will hadronize/decay and produce electrons, positrons, antiprotons, gamma rays, neutrinos etc As the neutralino is a Majorana fermion, the annihilation cross section to fermions go as f f m 2 f m 2 which means that we will be dominated by the heavy fermions (b and t quarks). Yield calculated with Pythia and tabulated for use by DarkSUSY (3 GeV 20 TeV) Higgs bosons are let to decay in flight summing up the yields from the decay products
9 Gamma rays DarkSUSY includes generic WIMP routines to calculate gamma yields from WIMP annihilations - Based on Pythia simulations for WIMP masses between 3 GeV and 20 TeV Works for any WIMP - Line signals - Internal Bremsstrahlung added separately Virtual internal bremsstrahlung is model dependent! SUSY calculation included.
10 Halo profiles Any spherically symmetric profile can be entered into DarkSUSY. Presets are available for - NFW - Moore - Burkert - Einasto - Adiabatically contracted profiles - Isothermal sphere In principle, a corresponding velocity distribution should be set simultaneously and DarkSUSY is set up to do this.
11 Charged cosmic rays diffusion model χχ p, D, e + Cylindrical diffusion model with free escape at the boundaries Energy losses on the interstellar medium (for antiprotons and antideuterons) or starlight and CMB (for positrons) Analytic expressions in DarkSUSY (new improved ones in coming DS 6) New in DS6: new Pythia runs and new anti-deuteron calculations (MC based coalescence)
12 Neutrinos from the Earth/Sun ρ χ χ χ velocity distribution Sun ν interactions ν oscillations ν µ Earth σ scatt Γ ann Silk, Olive and Srednicki 85 Gaisser, Steigman & Tilav 86 σ ann Γ capture Detector µ Freese 86 Krauss, Srednicki & Wilczek 86 Gaisser, Steigman & Tilav 86
13 Neutrinos from the Earth/Sun Full numerical integration over solar radius, summing most relevant elements ( all in coming DS 6) Full numerical integration over velocity distribution, no need to assume Maxwell-Boltzmann distribution In coming DS 6: full numerical integration over momentum transfer: arbitrary form factors can be used (do not need to be exponential). Database of form factors included. Interactions and oscillations in the Sun and to the detector simulated with WimpSim, results available as data tables in DarkSUSY.
14 Philosophy Modular structure (given the Fortran constraints...) Library of subroutines and functions Fast and accurate Standard Fortran - works on many platforms (g77 support dropped though) Flexible Version control (subversion) for precise version tagging
15 DarkSUSY 5 layout DarkSUSY Root src contrib include test misc lib docs share ac an Here are the main routines of DarkSUSY making up libdarksusy.a Contributed programs used by DarkSUSY Include files with all the DarkSUSY common blocks Test programs and template main program More test programs and templates Compiled DarkSUSY library Documen tation (made by make pdfmanual) Shared data tables needed by DarkSUSY
16 DarkSUSY 6 layout DarkSUSY Root src src_models src_halos lib data examples dd rd mssm ued generic wimp Compiled DarkSUSY library Shared data tables needed by DarkSUSY Test programs and template main program Here are the main routines of DarkSUSY making up libds_core.a Here are the particle physics models, each one creates its own library. Link to the one you want. In DarkSUSY 6 you link to the particle physics model you want to use More clear division between particle physics model and general routines General DS routines in src/ Particle physics model dependent routines in src_models/
17 DarkSUSY 6 concepts Interface functions. Functions/routines that the particle physics module should provide if you want to calculate a given observable - e.g. W eff is an interface function and needed by ds_core to calculate the relic density Replaceable functions. Any function/routine in DarkSUSY can be replaced by a user-supplied version. - e.g. you might want to have your own velocity distribution then you can just replace the standard routine
18 DarkSUSY 6 structure User replaceables Functions replaced and modified by user Main program User-supplied, e.g. examples/dsmain_wimp.f Linking to main library/user replaceable Linking to chosen module Calling sequence Alternative calling sequence (if linked) Particle physics modules src_models/ Halo modules src_halos/ DarkSUSY core library src/ libds_core.a Module mssm libds_mssm.a Interface functions Internal routines User replaceables Functions replaced and modified by user Module nfw libds_nfw.a Module einasto libds_einasto.a User replaceables User replaceables Observables (rates, relic density etc) Module silveira_zee libds_silveira_zee.a Interface functions Internal routines User replaceables Functions replaced and modified by user Module..... User replaceables User replaceables Functions replaced and modified by user Module..... User replaceables
19 Compile and install To compile and install DarkSUSY, do./configure [optional arguments] make Works on most platforms and with most compilers (gfortran, ifort, ) When you link, you link to ds_core and to the particle physics module of your choice, e.g. ds_mssm, ds_generic_wimp, etc gfortran -o dsmain dsmain.f -lds_core -lds_mssm - for MSSM gfortran -o dsmain dsmain.f -lds_core -lds_generic_wimp - for generic Wimp
20 And then we have the name DarkSUSY does now mean Dark SUsy Samt Ytterligare Modeller
21 Reference / download DarkSUSY is available at Long paper, describing DarkSUSY available as JCAP 06 (2004) 004 [astro-ph/ ] Manual (pdf and html) available DarkSUSY 6 coming soon with new paper Prepared for submission to JCAP DarkSUSY 6: An Advanced Tool Compute Dark Matter Propert Numerically T. Bringmann, a J. Edsjö, b P. Gondolo, c P. Ullio d and Bergström b
22 Conclusions DarkSUSY 5 publically available DarkSUSY 6 will be much more modular and include other improvements. Coming soon When comparing different signals, it is crucial to perform these calculations in a consistent framework, with e.g. a tool like DarkSUSY Merci! Joakim Edsjö edsjo@fysik.su.se
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